Display screen or portion thereof with graphical user interface for configuring a boiler or water heater application



FIG. 1 is a front view of the first embodiment of a display screen or portion thereof with graphical user interface for configuring a boiler or water heater application showing our new design; and,

FIG. 2 is a front view of a second embodiment thereof.

The outer perimeter broken lines in the figures show a display screen or portion thereof and form no part of the claimed design. The broken line showing of text and graphic elements forms no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with graphical user interface for configuring a boiler or water heater application, as shown and described. 